Doughnut shaped %-age usage pies in emoncms?

I saw some great charts in this blog entry:  and for a minute thought they were part of emoncms.  On closer inspection, I'm guessing they were done with the spreadsheet?

I'm wondering if anyone has any plans to add functionality like that to emoncms.  As there's more and more interest in per-circuit monitoring, it would be great to be able to graphically display that.  Currently I just do a fairly cheesy % display alongside each dial as shown below, but something like the doughnuts from the above posting (also shown below) would be a great feature.